i have a line on a set of D0oE heads are they at all compareable to gt40s? i kno they have to be machined to except unleaded fuel but is it worth it to get them or jus wait a few more weeks till i can afford a set of gt40s? thanks chuck

 

If the DOOE heads were reworked & ready to go i would go with them , but the GT 40s flow good & would be less expensive in the long run...Lew

 

yea thats the thing ill need to get them redone and i want to run LTs so gt40ps are outa the question

 

Check on craigs list , you may be able to find a set of reg GT 40s alot of the mustang guys used them , may allready have some work done to them , they part them out alot...

 

yea they go for 300 to 500 depending on the amount of work done and what they come with but i can get the D0oE heads for 100 or so im going for the better flowing of the 2 when all said and done

 

The better DOOE heads will be the 69-70 , they will have no air pump humps or holes in the back of the heads , so you can't use an air pump , they will have like 58-60 cc chambers that will bring your comp up to about 9.5 , will have adjustable rockers , press in studs probabley , you will wan't to machine for screw in studs , need hardened push rods & guide plats for roller rockers , i use these heads on my 302 , they work good for me ...

 

ill have to check the year on the heads to be sure then sounds like gt40s are less hassel

 

Untouched GT40's outflow untouched C9/D0 by a little so the newer heads is the better value, but don't spend more than $400 on either because you can have ported E7's that will outflow both by quite a bit for around $600. See http://thumperoforangepark.com/
For reference stock E7's flow about 155/106cfm, C9/D0 about 175/120, and GT40's about 192/128cfm

 

doesnt my truck have e7s on it so i could just get those ported and i would be ahead of the game would it still be ok to use with my SD set up o yea i have a 96 f250 4x4 351w 5sp

 

If the guy doing the porting has a flow bench and can produce some data to prove his work produces similar gains to those available from the place above.. at a competetive price, then yeah you may be able to do it cheaper. But if not you could be throwing money away.

Ported heads will work fine with the SD system as well.

 

so i need to find a good shop with a flow bench with good prices dont think ill be able to find that in jacksonville,nc they like to charge you as much as they can and do as little work as they can to get by and they never do it right... soo gt40s it is hahaha i know theres that write up about the shorties that work with the gt40ps but what about long tubes?

 

I haven't tried myself but there have been posts here with guys that have sucessfully installed longtubes with GT40p's, and it wasn't much of a problem apparently... just some minor clearancing necessary on a couple header tubes.

 

hmm well the gt40ps flow better dont they? i dont know about every where else but here there alot cheaper you can find gt40ps for 100 150 bucks compared to the 3-500 ull pay for the gt40s

 

Yes the P's actually outflow the regular GT40's so they're worth considering.

 

cool any recomendations on LTs for the gt40ps? or just get ones for a stock motor and go from there?