Help with valve springs upgrade - a problem

trumpet1 · November 11th, 2008, 06:58 PM

Now you 5.0'ers don't get mad. I am posting this here because you probably know the answer, even though the question is about stock '68 302 heads.

I swapped in a mild lift cam upgrade, and was told to get new valve springs. Mustangs Unlimited recommended a Trick Flow upgrade kit. The kit wants 1.8" under the spring retainer to the spring seats. But the stock height is 1.66" and there is no way I can get close to 1.8" I think squeezing them to 1.66" defeats the purpose of the high lift cam?

Do I start over?
Thanks.

3521 · November 11th, 2008, 07:50 PM

Haven't looked into machine shops to have the seats cut?

Racinjason81 · November 11th, 2008, 08:01 PM

you could get longer valves

JBIGBOOTSY · November 11th, 2008, 08:14 PM

Originally Posted by 3521

Haven't looked into machine shops to have the seats cut?

The easiest, and most cost effective answer.

Brian@PAR · November 14th, 2008, 12:19 AM

The only way for anyone to help you is for you to post the specs on your parts. We know the springs call for a 1.8 installed height (whether that is right or not is unknown) but we need to know what do the springs coil bind at and what is the lift of the cam. You are not going to cut the seats .140 so that is out but you can get offset locks and you may not need 1.8 IH. I just did springs on a set of 68 289 heads and it took over 300 bucks worth of springs, locks, retainers and shims to get them in right on an ecam.
This was using the stock valves which have the same installed height as the heads you have there.

November 11th, 2008, 06:58 PM	#1
trumpet1 Newbie Join Date: Oct 2006 Posts: 24 iTrader: 0 reviews	Help with valve springs upgrade - a problem Now you 5.0'ers don't get mad. I am posting this here because you probably know the answer, even though the question is about stock '68 302 heads. I swapped in a mild lift cam upgrade, and was told to get new valve springs. Mustangs Unlimited recommended a Trick Flow upgrade kit. The kit wants 1.8" under the spring retainer to the spring seats. But the stock height is 1.66" and there is no way I can get close to 1.8" I think squeezing them to 1.66" defeats the purpose of the high lift cam? Do I start over? Thanks.

November 11th, 2008, 07:50 PM	#2
3521 Regular 1988 Gt Cali car Join Date: Nov 2008 Location: 29 Palms Posts: 124 iTrader: 0 reviews	Help with valve springs upgrade - a problem Haven't looked into machine shops to have the seats cut? Last edited by 3521; November 11th, 2008 at 07:51 PM. Reason: typo

November 11th, 2008, 08:01 PM	#3
Racinjason81 Hardcore Enthusiast Join Date: Feb 2007 Location: New jersey Posts: 1,559 iTrader: 0 reviews	you could get longer valves __________________ Heres a real funny video youtube.com/watch?v=ojB7KkaR03I VTEC stands for Very Torqueless Economy Car Honda stands for Hold On Not Done Accelerating 1991 LX 5.0 H/B(T-70 turbo coming soon)

November 14th, 2008, 12:19 AM	#5
Brian@PAR Newbie Join Date: Nov 2008 Location: Phoenix AZ Posts: 25 iTrader: 0 reviews	The only way for anyone to help you is for you to post the specs on your parts. We know the springs call for a 1.8 installed height (whether that is right or not is unknown) but we need to know what do the springs coil bind at and what is the lift of the cam. You are not going to cut the seats .140 so that is out but you can get offset locks and you may not need 1.8 IH. I just did springs on a set of 68 289 heads and it took over 300 bucks worth of springs, locks, retainers and shims to get them in right on an ecam. This was using the stock valves which have the same installed height as the heads you have there. __________________ PeteAndersonRacing

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