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Originally posted by takeone51
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You can bolt on a B6 head for the bigger valves.90 Festy (Larry)--B6M (Matt D. modified B6 head), header, 5-speed, Capri XR2 front brakes, many other little mods
09 Kia Rondo--a Festy on steroids!
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hot dog!! i guess i'll be junkyarding for a b6 head
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TominMO said:
"You can bolt on a B6 head for the bigger valves."
You sure about that? I think that if that worked, we'd know more about it by now. I think I've read others saying it won't fit right. I could be wrong.
Karl'93GL "Prettystiva" ticking B3 and 5 speed, backup DD; full swaps in spring!
'91L "AquaMutt" my '91L; B6 swap/5 speed & Aspire brakes, DD/work car
'92L "Twinstiva" 5sp, salvage titled, waiting for repairs...
'93GL "Luxstiva," '94 B6 engine & ATX; needs overhauled
'89L "Muttstiva," now a storage bin, future trailer projectComment
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Porting a stock head is a waste of time.....imo......Going with a thinner head gasket or milling the head would benefit you more, but a high compression motor likes better gas. Just my .02c-Greg
Euro-bprt...WORLDS FASTEST FESTIVA !!! 11.78@115.9
BP, G trans, Megasquirt/ 550cc inj. t3/t3 (tbird) Garrett, REAR TURBO!!!! AND AC!!!!
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http://www.youtube.com/watch?v=vU_eX...9Pwqw-oe8s2OYQComment
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Never done it myself, but from what I read, the bigger valves in the B6 head will interfere with the block (B3 has a smaller bore) and will require notching the top of the cylinders for clearance. As I said in a previous post, If this is true, then even if you notch the cylinders the valves will be so close to the cylinder walls that flow will be adversely effected. Someone else on here probably knows for sure. Also, my guess is the chambers are larger and will lower compression, which is the LAST thing you want.Originally posted by Safety Guy View Post
A good performance valve job will help as much as anything. A B6, B8 or BP swap will cost about what a good valve job does and give you more power anyway.Brian
93L - 5SP, FMS springs, 323 alloys, 1st gen B6, ported head & intake, FMS cam, ported exhaust manifold w/2-1/4" head pipe.
04 Mustang GT, 5SP, CAI, TFS plenum, 70mm TB, catted X, Pypes 304SS cat-back, Hurst Billet+ shifter, SCT/Bama tuned....4.10's & cams coming soon
62 Galaxie 2D sedan project- 428, 3x2V, 4SP, 3.89TLOC
1 wife, 2 kids, 9 dogs, 4 cats......
Not enough time or money for any of themComment
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When chevy released the 396 / 425 HP motor in 1965 it was based on the eariler 427 mystery motor. Chevy did not want to give up the 425 HP rating, even on the newer 396. The way around this was to use the large valve heads, the only problem was the valves were to big for the smaller 396 bore. So what they did was fly cut the top of the 396 cylinders to clear the valves. While not a perfect fix it did work.
I have a 396 with a set of 502 big block chevy heads on it, complete with fly cut cylinders to clear the massive 2.25 intake vlaves, the motor puts out about 550 HP and does 10.32 ets.
so I dont think it would be problem mating the b6 heads on a b3 as long as it passes a moch up test.
HP gain?? ebven with the valve valve shrouding issues I sure you would pick up a couple hPmoney pit
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...and loose a couple points of compression unfortunately.Trees aren't kind to me...
currently: 2 88Ls (Scrappy and Jersey), 88LX, 90L(Pepe), 91L, 91GL (Skippy) 93 GL Sport (the Mighty Favakk), 94 (Bruce) & 95 Aspire SEs, 97 Aspire (The Joker),
94 Justy 4WD, 87 Fiero GT, plus 2 parts cars. That's my fleet.
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