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Old 10-17-2010, 05:45 PM
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355 build

Just bought a 1991 S10 with a 355 sbc.
It has stock bottom end with flat top pistons.
Doug Herbert solid lift cam 510 intake & 530 exhaust.
Hurricace single plane intake with 750 demon carb.
The issue is it has stock heads.
What would be a good head for this combo?
Would there be any gains with going to 1.6 roller rockers on
the intake side & 1.5 on the exhaust?
This truck is for drag race only.
Thanks in advance for the help.

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Old 10-17-2010, 07:32 PM
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I like the dual pattern

Quote:
Originally Posted by corkym
Just bought a 1991 S10 with a 355 sbc.
It has stock bottom end with flat top pistons.
Doug Herbert solid lift cam 510 intake & 530 exhaust.
Hurricace single plane intake with 750 demon carb.
The issue is it has stock heads.
What would be a good head for this combo?
Would there be any gains with going to 1.6 roller rockers on
the intake side & 1.5 on the exhaust?
This truck is for drag race only.

I like the split pattern grind you have, but sounds like you have more cam than heads for now; too much for stock springs for sure. Do you know the casting number of the heads you have?

PS> Economy heads a bit big but maybe not for your cam and drag only>ebay# 190455612977

Last edited by Duntov; 10-17-2010 at 07:53 PM.
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Old 10-17-2010, 07:48 PM
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What's your performance goals? What octane fuel do you run? You race at NoProblemRaceway?
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Old 10-17-2010, 07:52 PM
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355 build

1- I do not know the casting number at this time.
2- I plan on running 93 octane pump gas.
The plan is to run at NPR and some at SCR.
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Old 10-17-2010, 08:53 PM
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Quote:
Originally Posted by corkym
1- I do not know the casting number at this time.
2- I plan on running 93 octane pump gas.
The plan is to run at NPR and some at SCR.
Need performance goals/RPM to determine intake runner size, normally I like
a port in the 170-190 cc range for a 355 in a moderate RPM range (4500-7000).
Combustion chamber size needs to be ~ 64-67 cc with flat tops for pump gas.

Do you know the cam duration @ 0.050"

I have been racing steady at NPR for about 7-8 years
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Old 10-18-2010, 01:15 PM
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These heads are great for the money and power you can plan on around $500
total assem.

http://www.competitionproducts.com/P...fo/223200080A/
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Old 10-18-2010, 02:06 PM
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Quote:
Originally Posted by Badazz93
These heads are great for the money and power you can plan on around $500
total assem.

http://www.competitionproducts.com/P...fo/223200080A/
Looks like a great deal. I'm bookmarking it for sure. I didn't know these heads were still around. I heard one time they got bought out by ProComp and were gone. Do you know if they still have the quality of the early days?
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Old 10-18-2010, 04:50 PM
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Quote:
Originally Posted by Duntov
Looks like a great deal. I'm bookmarking it for sure. I didn't know these heads were still around. I heard one time they got bought out by ProComp and were gone. Do you know if they still have the quality of the early days?
Do not confuse ProTopline(New Zealand) with Procomp(Australia/Chinese), they are not connected in any way. ProTopline was bought up by Competition Cams and they used the company assets to resurrect their Racing Head Service(RHS) side of their business that had been mothballed for 15 or so years.

Competition Products on the other hand is just selling off the remaining old stock ProTopline's in their warehouse, some head sizes they no longer have, it is limited to what they have left and when they are gone,... thats it. Now they are carrying the RHS line.
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Old 10-18-2010, 05:13 PM
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Good info for me and the OP!

Quote:
Originally Posted by ericnova72
Do not confuse ProTopline(New Zealand) with Procomp(Australia/Chinese), they are not connected in any way. ProTopline was bought up by Competition Cams and they used the company assets to resurrect their Racing Head Service(RHS) side of their business that had been mothballed for 15 or so years.

Competition Products on the other hand is just selling off the remaining old stock ProTopline's in their warehouse, some head sizes they no longer have, it is limited to what they have left and when they are gone,... that's it. Now they are carrying the RHS line.
Good info EricNova
That's something I've wanted to know for a long time. I read an article a couple of years back which apparently had faulty info, and led me to believe that topline was bought by procomp and it was now Chinese junk. They did advertize heads under the name ProComp called topline for a bit, but I only saw it once and that was in a mail order mag.

So anyway, I really was sold on the old World Topline heads like 5 or 6 years ago. I still have a set of 235s on a 406 that are the best 23* heads I've ever seen.

If these are the same heads I'm going to snag a couple of pair before they are gone. And if they are I highly recommend them to the OP.
Is the RHS trademark as good as what they bought out?
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Old 10-18-2010, 05:51 PM
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[I][I]Need performance goals/RPM to determine intake runner size, normally I like
a port in the 170-190 cc range for a 355 in a moderate RPM range (4500-7000).
Combustion chamber size needs to be ~ 64-67 cc with flat tops for pump gas.

Do you know the cam duration @ 0.050"

I have been racing steady at NPR for about 7-8 years


The cam duration is: intake 260 and exhaust is 272.
Performance goals: Low 12 second ET?????
Orginal onwer said he was shifting between 6500 & 7000 RPM.
I am a newb, more questions than answers.
Thanks for the input.
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Old 10-18-2010, 06:06 PM
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Quote:
Originally Posted by Duntov
Good info EricNova
That's something I've wanted to know for a long time. I read an article a couple of years back which apparently had faulty info, and led me to believe that topline was bought by procomp and it was now Chinese junk. They did advertize heads under the name ProComp called topline for a bit, but I only saw it once and that was in a mail order mag.

So anyway, I really was sold on the old World Topline heads like 5 or 6 years ago. I still have a set of 235s on a 406 that are the best 23* heads I've ever seen.

If these are the same heads I'm going to snag a couple of pair before they are gone. And if they are I highly recommend them to the OP.
Is the RHS trademark as good as what they bought out?
The RHS head is the old ProTopline head, basically the same piece just a different name.

I know what you mean, we have one set of the old ProTopline Iron Lightning, 235cc runner 2.08" valve, a very good iron head.

EngineQuest Heads is basically the old ProTopline As-Cast Iron line. Real good for the money.
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Old 10-18-2010, 07:08 PM
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Quote:
Originally Posted by corkym
The cam duration is: intake 260 and exhaust is 272.
Performance goals: Low 12 second ET?????
Orginal onwer said he was shifting between 6500 & 7000 RPM.
The duration numbers you posted are @ 0.050" right? Thats way more
than what you will need. You will need a loose converter, low gear and
good traction to get it to ET well. Not a problem but the cam will perform
best with higher compression than what you can run with 93 octane fuel.

With that said you need to decide if you want a different cam with ~10:1
compression for pump gas or the cam you have with higher compression
and race gas. Decide this before you buy cylinder heads, this way you can
get the chamber size you need to get the compression where you need it
with out changing the pistons.

Either way look for a good flowing head (~240-250 scfm) with a small port
(~170 -190cc intake)
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Old 10-19-2010, 05:23 AM
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Thanks for your help. Like I said I bought this truck with this combo.
It's not what I wanted but, I thought it was a good starting point for the
money and to keep piece back at the house.
On another note would you know of anyone selling S10 (1991) parts,
namely a rearend.
Hope to see you at the track soon.
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Old 10-19-2010, 09:44 AM
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Quote:
Originally Posted by corkym
The issue is it has stock heads.
What would be a good head for this combo?

Need more input... There are stock heads and then there are stock heads.

1st question, what markings do they have on the ends of the heads? A good set of humper-pumpers will support some serious horsepower, especialy if they are ported.. Vortecs even moreso. On the other hand there are a lot of "stock" heads that are best used for scrap. Pull a valve cover and get your casting marks before you start tearing it apart and throwing money at it.

Knowledge is (horse)power..
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Old 10-19-2010, 03:32 PM
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Do you have centerbolt valve covers?
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