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h0trod 03-07-2013 08:27 AM

pontiac edelbrock rpm peformers
im running a set of STOCK edelbrock rpm peformers on a pontiac 354.

rockers are a stamped roller tip crane 1.52:1

i have a set of PRW's 1.65:1 full roller rockers.

do the pushrod holes need opening up?

before you ask "what the hell did you put those on a 354 for"?

i bought the engine for a grand. couldnt pass it up!

this engine is going into my 30 oldsmobile.

replacing a junkyard 389 and a stock th350

with this aluminumheaded 354+ (dont know the bore until i pull the heads)
and a st-10!

have a great day!

cobalt327 03-07-2013 01:38 PM

Good chance you'll need to open them up for 1.65 rockers.

If the block hasn't been notched at the tops of the bores to help reduce the valve shrouding, it should be done.

LATECH 03-07-2013 04:25 PM

:D sweeeet :D

Mr. P-Body 03-07-2013 05:01 PM

Well, it certainly IS different... (:- Interesting refering to the engine as "354". It's true, but it's refered to as "350P" in most parts books. I think Pontiac "down-sized" the rating to not step on toes in other GM divisions by having a "bigger" little engine.

From looking at the pics, they appear to be the "D-port" castings. What is the chamber volume? I know the round-port versions well, but have yet to build the D-port. I've read they have high-swirl chambers, similar to the KRE d-ports. We've built several engines with those. Good heads.

The round-port versions have to have the pushrod holes elongated for 1.65s, so I would imagine CB327 is right, they'll need attention. Be careful as it's real "easy" to over-cam a 350P. The small bore makes the large valves a liability, not an advantage. As said, the bores NEED the chamfer, but even that isn't enough. We've learned 350s "like" the 1.96/1.66 combination, not unlike 389.

Compression is important, so the chamber information is necessary.


h0trod 03-07-2013 06:23 PM

thank you all for replying!


Originally Posted by Mr. P-Body (Post 1654526)
Well, it certainly IS different... (:- Interesting refering to the engine as "354".

From looking at the pics, they appear to be the "D-port" castings.

Be careful as it's real "easy" to over-cam a 350P.
Compression is important, so the chamber information is necessary.


point #1, i call an engine by the inches! im short, so i need all i can get!

point #2, look a little closer at the picture. those are casting # 77's D port cast irons!
the edelbrocks i have are supposedly 72cc round port heads. they are bolted on the engine, so i cannot measue them.

the 354 these said heads are on, i drove it around the property (in a 77 t/a)for a couple of weeks until i decided that a 13.1 was not good enough for my hotrod. TRANSPLANT TIME!
however its got some kind of valve train problem, like a sticky lifter, mabe a valve spring, i dont know yet. but it would miss like a bad dog!

im thinking its a lifter, so i want to re-cam it.

but right now im on a slim budjet, and i gotta order a scatter sheild and a throwout bearing next. then i gotta convert the hotrod from an auto..

the joys of fabrication.

good day.

killeratrod 03-09-2013 03:29 PM

wow , that is a nice ride. Great job on the build.

69 widetrack 03-10-2013 06:05 AM

I'm a huge Pontiac fan and thank you for calling it a 354...just like Mr. P-Body said, they didn't want to piss off their GM counter parts by having a bigger little motor than they had is probably why Pontiac went to a 326 so they wouldn't step on any 327 toes. Very cool build, love those Pontiacs.


Mr. P-Body 03-10-2013 09:24 AM

That calculates to just over 9:1. Will run well on 89, probably just fine on 87. The round port head has the "old fashioned" Edelbrock chamber. It "likes" more timing than the stock heads. 38 "total" isn't uncommon. Unfortunately, the valve placement isn't much better than the factory large-valve heads, and the small bore will inhibit flow (shrouded intake valve). Lift should be kept under .550". There's a good chance for valve-to-block interference too, so be careful.

In the light car, this thing should catch revs very quickly. You may have found the one application where the 350 Pontiac can give 350 Chevy a problem. With the flow of an "out of the box" E-head, the little engine can see 7,000 RPM easily. A solid roller and all the trimmings would make it a very potent Poncho... But always remember, the 350 has the same "issues" as 400 and larger. The connecting rods... The smaller bore does nothing for the rod bearing and cast rod...

PM me and I'll make a cam recommendation.


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