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Old 02-26-2006, 11:04 PM
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1.5 stock to 1.6 roller rockers?

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I have pretty good heads. They are TFS aluminum with 2.20/1.60 valves. Cam is 454 lift and 216 duration. Would I likely see any benefit going from 1.5 stock to 1.6 roller rockers. Also this will change my lift to about 484, the info on the heads say the springs I have in now are good up to 480 lift. Will they still be o.k. at 484?

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Old 02-27-2006, 05:06 AM
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May or may not, at any rate if you go with the 1.6 rockers you still need to verify if you have any spring bind.

Vince
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Old 02-27-2006, 07:06 AM
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CALL TFS and ask and to be absolutely sure.....or risk destroying the motor first time you rev it, lots of good advice here but "we" didn't design those heads!

side note: I do appreciate your trying to find more hp in the motor, small changes and razor tuning can get you 10-30hp, but that won't change the car 3600lb weight to hp ratio enough to show on the et slip (maybe a 1/10th?).....working on losing weight and suspension will gain you more for less....rough ex:from my previous post, on the bottle, 3200lbs=11's, 3600lbs=12's with your motor as is

doesn't your strip have bracket racing? way more fun than trying to be absolute quickest...
hee hee hee... you get to play "mind games"...."detune" on purpose and run slower with a higher et on the windshield for break out time one round to the next....so it's driver and motor for who wins
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Old 02-27-2006, 10:31 PM
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Thanks red for your replies on my post. I really appreciate the help. Yes they do have bracket racing. I am just trying to learn all I can and then decide what to and not to do. I agree I do need gears first and foremost. After that we will see. But I will try to squeeze as much out of it as I can where I can hahaha well as long as I can afford it. Gears are coming this summer I hope.
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Old 02-28-2006, 07:36 AM
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oregon,
thanks for the thanks but to be clear, I don't like 4.10's on a street car

clarification?.....there are no doubt 100+ (magazine articles) "track tweeks tricks" to the body and suspension that cost little or no money that will together definitely drop your ET

I'll give you just one that might help the most...cause it is an "open" 3.08 and all old cars flex like crazy....goal: equal burn out/traction pattern for both tires same as a posi......
just put approx 1" of washers on the D side sway bar, this "preloads" the push down by the motor and reduces body flex when you floor it...result: more weight transfer to the P rear tire.....just tinker with the combo of how many washers-urathane bushings and/or rubber bushings (maybe both sides) till it's right...go real stiff gets annoying or RR tracks etc, 5 minutes to swap at the track?
with your motor/wheebase flex/weight...(?) 2/10th's quicker but 1/10th for free is still free (look at your 60' times for results)

want to learn?...go to primemedia.com (publish all the mags) links page... pages and pages of tech articles under each magazine....Hot Rod, Super Chevy, Car Craft, Fast Fords, etc etc

and thanks again for saying thanks...one of my pet peeves on this board
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Old 02-28-2006, 08:37 PM
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Actually the car is a posi trac. It is an 8.2 ten bolt posi.
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Old 02-28-2006, 11:28 PM
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you want equal burn out go with a detroit locker..... that will give you one hell of an equal burn out, but its not cheap, but it is better then posi....

but, back to the rockers. i would go with the 1.6 rollers, BUT you have to make sure that your valve springs arent bottoming out. it may run ok at idle, but at soon as you rev it you'll break almost every rocker on your heads and the ones that arent broke will be cracked....
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Old 02-28-2006, 11:51 PM
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Well I think the springs are good up to .500 lift and with the .454 with stock 1.5 rockers the 1.6 should be .484. So I think I would be o.k. The guy at the shop thinks I should go with different springs anyway so I probably will. He is a drag racer and builds his own stuff which all seems pretty good.
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Old 02-28-2006, 11:59 PM
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see, the problem with the springs is most companies over estimate what the actual springs will hold, and if your within .016 i would suggest getting better springs too.

Like i said before, idle and LIGHT power they may be ok... but you almost want a little tolerance in the valve springs to compensate for other condidtions.
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Old 03-01-2006, 12:17 AM
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Yep, I will go with better springs and the 1.6 rollers when that time comes.
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