What to watch while using pushrod tool?
Thread Starter
12 Second Club
iTrader: (9)
Joined: Jun 2006
Posts: 1,051
Likes: 1
From: Grand Forks, North Dakota
What to watch while using pushrod tool? Yes i have been reading the many posts on this. I have a pushrod length checker tool at home now and plan on checking my pr length. All i have to do is get the cyl top dead center then put the tool in and adjust it to 22 ft lbs.....now i was told by a friend to watch the rocker on the valve to make sure it stays in center through a full rotation? Is this the way to do it? I read someone say something about watching the compression of the lifter..how the heck do u do taht?
Any help please?
I will prly put the 7.400 ones in and watch first.
Any help please?
I will prly put the 7.400 ones in and watch first.
Get lifter on base circle of cam and against the cam (not being held up by the retainer, so put in the stock pushrod and just press to make sure the lifter doesn't move), install pushrod checker and rocker. Tighten rocker, 22 lb-ft isn't necessary, that only preloads the bolt. I would put 8-10 lb-ft on the rocker. Unscrew the pushrod until it just takes out the clearance, this is your measurement. (Don't go real tight or you may depress the plunger in the lifter). Remove pushrod without turning/moving and read the length via the scale on the pushrod. Measuring end to end is OAL, but the pushrods come in gauge length, they are not the same. Comp has a description of the length definitions on their web site. Repeat for exhaust. Once you have your measured length, add your lifter preload to the length and you obtain the required pushrod.
Thread Starter
12 Second Club
iTrader: (9)
Joined: Jun 2006
Posts: 1,051
Likes: 1
From: Grand Forks, North Dakota
thanks,
how important is it to have lets say 7.35 over 7.40 if 7.35 is the proper length.
Also the ones on there are thunder racing .080....What kind wouldu buy if you would?
how important is it to have lets say 7.35 over 7.40 if 7.35 is the proper length.
Also the ones on there are thunder racing .080....What kind wouldu buy if you would?
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
If your heads are unmilled (which they should be unless you have valve reliefs) and with the 233/239; you'll need to run 7.425 p-rods with stock gaskets.
Comp cam Hi energy p-rods come in .025 increaments.
Comp cam Hi energy p-rods come in .025 increaments.
Thread Starter
12 Second Club
iTrader: (9)
Joined: Jun 2006
Posts: 1,051
Likes: 1
From: Grand Forks, North Dakota
the heads are milled 20 thousandsths....what makes you say they should be longer for this spec. cam?? I watched the rocker and with the 7.400 they rock a lot more on the stem, and the 7.35 rocked less and stayed more towards the middle...7.30 bearly moved ithink they are too short...if i had to guess i would guess 7.35 but the 7.4 seemed ok but i noticed a lotta rocker swing. None looked horribly but prly not optimum....
THANKS for your input, im just trying to figure if i should order some today or not...
THANKS for your input, im just trying to figure if i should order some today or not...
Thread Starter
12 Second Club
iTrader: (9)
Joined: Jun 2006
Posts: 1,051
Likes: 1
From: Grand Forks, North Dakota
haha sorry to post so many times, but also i have a rocker shaft that all the rockers sit in, they should be seated down and set at 22 ft-lbs and at that pointzero lash should be achieved for proper length correct? i did post this on another place but u seem helpful and i want to order today or maybe not order. The length was btwn 7.35 and 7.30 right in middle i would guess so preload brings it to 7.35 pretty much. The rockers didnt look bad or anything form the 7.400s on there tho..i guess im not an expert.
learning experience
learning experience
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
12 Second Club
iTrader: (9)
Joined: Jun 2006
Posts: 1,051
Likes: 1
From: Grand Forks, North Dakota
well the hobag i bought it from never sent me the specs, but he had said they are larger valves....like...maybe 2.08 and 1.60 or something then i think he said 2.02 not sure, bigger tho he said....so the tipping rocker on the stem is fine? It ran fine...seemed to be a little ticking in the front side passenger of engine area not sure what yet...
Thread Starter
12 Second Club
iTrader: (9)
Joined: Jun 2006
Posts: 1,051
Likes: 1
From: Grand Forks, North Dakota
what would it hurt if they are a tad long? it ran fine so the valve couldnt be kept open much right? I dunno im new to this, just seemed like last night at baselobe that the 7.400 was tightly pushed against the rocker b4 the rocker was fully seating on the rocker "bar"
Thread Starter
12 Second Club
iTrader: (9)
Joined: Jun 2006
Posts: 1,051
Likes: 1
From: Grand Forks, North Dakota
how would it not be absolutely running horrible if there wasnt ptv? The valves would be all bent woulnt they? Like i said it ran fine it had to be close?
could the valves be shorter the stems?
could the valves be shorter the stems?
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Something not Kosher here. Either you are mistaken about the head specs or I dunno.
What is the cam specs LSA/ICL?
TSP recesses the 2.04 valves to fit that cam for better valve clearance..
I'm puzzled.
What is the cam specs LSA/ICL?
TSP recesses the 2.04 valves to fit that cam for better valve clearance..
I'm puzzled.
Thread Starter
12 Second Club
iTrader: (9)
Joined: Jun 2006
Posts: 1,051
Likes: 1
From: Grand Forks, North Dakota
Yea man im not sure whats in it just hearsay....it must be 2.04 then or something to clear....would u just install the rockers that were in there. He said that someone said it woul dbe fine and then afr said it wouldnt......Who knows, He claimed to have it dynod at 464 so it cant be set too bad.