Question on Quench and compression - Northern California Ford Owners

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Posted by tad2786 (Member # 8567) on :

Im in the process of building a 306 from a shortblock wich consists of stock polished crank, stock style forged rods, probe SRS forged pistons(10471-030 for twisted wedge heads, trick flow 170 twisted wedge 58cc track heat heads with come 1.6 roller rockers, Trick Flow stage 2 Camshaft, weiand excellarator intake and a quick fuel 650 carb. 3.55 gears, and a t5 in a 64 ford Ranchero.

So I am building this 306 as my first motor of my own and therefore just want it to be optimized. The machine shop that put the shortblock together decided to put in a dome top piston when I told them I wanted a 10-10.5 compression, in 91 octane street motor. Probe list's that piston as 11.4-1 compression with a 58cc head wich seemed to high for 91 to me. My friend who works for a local speed shop recomended me a super thick(.075") MLS head gasket. I bought them as the maching shop said it would bring me back down to a much more street friendly 10.25-1. THEN i learned about quench..... what would be the most cost effective, yet best option for me at this point? Or am I just over thinking this in a light, already overpowered car? What compression do you guys run on 91 octane with a CARBURETOR?

[ May 21, 2012, 09:26 PM: Message edited by: tad2786 ]

Posted by tad2786 (Member # 8567) on :

CAMSHAFT: http://treperformance.com/i-653-tfs-stage-2-camshaft-sbf-ford.html
PISTONS: http://www.summitracing.com/parts/PBP-10471-030/
HEADS: http://www.summitracing.com/parts/TFS-51400010-M58/

[ May 21, 2012, 09:32 PM: Message edited by: tad2786 ]

Posted by triple b (Member # 8763) on :

get different heads if you want the quench i zero decked my block and my quech was perfect with a .041 headgasket little tricks make power not alot so is it worth it to you.....but it going in a ranchero not a drag car so i would just use the thick headgaskets and be do you will be happy either way not like your shooting for 10sec 1/4 mile
to be honest its hard to get a perfect quench you measure all the pistons in/out the hole i average a couple out and a few in its was a wash thus i call my motor zero decked but in actual life some are out the hole and some in....dude just run it and if you want more power lol go to a different head gasket thats what i do as long as the piston and valve have clearence and 91 is doing good for your compression

[ May 21, 2012, 09:51 PM: Message edited by: triple b ]

Posted by tad2786 (Member # 8567) on :

I agree with you on that point maybe I can have the combustion chambers and ports opend up a bit later on down the road and throw on a thinner head gasket. Bought the heads to go on a stock motor that why I went with the 58cc chamber. Don't want to get rid of them now if I can help it. THANKS

Posted by triple b (Member # 8763) on :

those heads will be easy for you to sell or trade for the bigger chamber ones if you need to

Posted by turbo50 (Member # 6700) on :

Mill the dome of the pistons the needed amount and zero deck the motor.

Run a vacuum advance dizzy to help tame the motor at part throttle and light load.

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