gt40p head piston/valve clearence

lxhatch91 · Jan 17, 2019

hi guy i want to put gt40p heads and b303 cam on my lx 1991 on the stock motor with upper and lower gt40 intake of corse im gonna change the spring and put roller rockers 1.6 but my question is do i need to check piston to valve clearence or i got enought space with this cam. thanks (how many hp i will gain)

KZGUNS · Jan 17, 2019

its always good to check piston to valve clearance. it only takes 10 min. hardest part is lifting the head.

JD1964 · Jan 17, 2019

The bcam should not cause a valve/piston clearance problem with 1.6 ratio. Instead of the cam swap, you might want to consider keeping the stock cam and jump up to 1.7 roller rockers. The jump to 1.7 will net just about the same lift as the bcam, slightly more than a b with 1.6 actually. The lower duration of the stock cam will help you retain better bottom end tq as well. If your MAF and TB are upgraded above stock, the stock cam will pull hard to the factory rev limiter which mine is at 6200rpm.

Heres a nice pedestal mount 1.7 kit. Change the springs and push rods too.

https://lmr.com/item/M6564A50/1979-...15pvdxe8VKnsFkE2zDpGdW9Qn8UUd-e8aArKvEALw_wcB

JD1964 · Jan 17, 2019

If you do pull your stock cam, spray it down with WD40, wrap it in plastic and keep it. You might be surprised that someone want's to but it sometime, provided its in good condition.

JD1964 · Jan 17, 2019

See? 12 watchers on this one.

http://rover.ebay.com/rover/1/711-5...0001&campid=5335821607&icep_item=223158632239

lxhatch91 · Jan 18, 2019

thanks guy for the advice. and wath is the best valve spring kit for the gt40p if i put b303 or if i keep the stock one

lxhatch91 · Jan 18, 2019

i forgot how many hp can i get from this lilte combo. gt40p heads with upper lower intake explorer roller rocker and cam ?

JD1964 · Jan 18, 2019

50-75 hp gain depending on how well tuned.

gt40p head piston/valve clearence

lxhatch91

Member

KZGUNS

I can swing up to 11”

JD1964

there is enough sticking out to grab on to

JD1964

there is enough sticking out to grab on to

JD1964

there is enough sticking out to grab on to

lxhatch91

Member

lxhatch91

Member

JD1964

there is enough sticking out to grab on to

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gt40p head piston/valve clearence

Member

I can swing up to 11”

there is enough sticking out to grab on to

there is enough sticking out to grab on to

there is enough sticking out to grab on to

Member

Member

there is enough sticking out to grab on to

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