How much can you mill Pontiac 6X heads?
Heads can also be milled to increase the compression ratio. Generally, uncut Pontiac heads can be milled at least 0.040 inch; each 0.005 inch removed from the cylinder head deck surface decreases the chamber volume about 1 cc on ’67-and-later open chamber heads.
Are Pontiac 6X heads any good?
6x are the go-to performance pontiac head. The one downside is they have very large chambers, so on a 400 they will require domes or lots of milling to get anywhere close to a compression that would support 500 hp… unless he want’s to go forced induction, which would be a great idea with 6x.
What kind of head does a Pontiac 6x 8 use?
Pontiac 6X Heads, Advice Needed (pontiac masters) The 6x-8 heads are low compression heads, they will work good on a 400 engine if prepped properly, larger exhaust valves, port work, etc. 500 hp is a pretty stout 400 cid pontiac motor. I would play to the pontiac engines strength, which is torque. 500 lb ft of torque is doable.
What are the intake valves on a 6x head?
All stock 6X heads have 2.11″ intake valves and 1.66″ exhaust valves. 7. All stock 6X heads can be reconditioned, milled and performance enhanced.
How much horsepower does a 6x head have?
6X heads, swap in some swirl polished valves, basic polish job and 3 to 5 angle valve job and matched ports and a Pontiac can push well over 500 lb ft of torque, MUCH more useful over 500 HP. keep the cam choice reasonable and as said before, use forged rods and pistons and some good ARP fasteners.
Where is the casting number on a Pontiac?
Casting Number The number is usually cast at the center or the right or left exhaust port. Some heads may have the number cast below the spark plug or below the valve cover. The casting on the outside of the head was composed of 6 or 7 digits for early heads.
Pontiac 6X Heads, Advice Needed (pontiac masters) The 6x-8 heads are low compression heads, they will work good on a 400 engine if prepped properly, larger exhaust valves, port work, etc. 500 hp is a pretty stout 400 cid pontiac motor. I would play to the pontiac engines strength, which is torque. 500 lb ft of torque is doable.
All stock 6X heads have 2.11″ intake valves and 1.66″ exhaust valves. 7. All stock 6X heads can be reconditioned, milled and performance enhanced.
6X heads, swap in some swirl polished valves, basic polish job and 3 to 5 angle valve job and matched ports and a Pontiac can push well over 500 lb ft of torque, MUCH more useful over 500 HP. keep the cam choice reasonable and as said before, use forged rods and pistons and some good ARP fasteners.
How tall is the intake port on a Pontiac head?
PONTIAC HEAD CHART CASTING NUMBER YEAR & FACTORY APPLICATION CHAMBER VOL# CC’S EXHAUST PORT NOTEWORTHY ATTRIBUTES 47 68 & 69 350 AUTO TRANS 72 D-Port 1.96/1.66 48 69 RA3 400, 350 HO 68 D-Port 722 69 RA4 GTO FBIRD 72 ROUND TALL INTAKE PORT 12 70 400 RA GTO FBIRD 72 D-Port