general engine building cost and ?
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Senior User
Joined: Dec 2003
Posts: 225
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general engine building cost and ?
im looking for an aproximante price for rebuilding my 351m.
heres what i planning on new pistons and rods, bearings, the machine work, cam, and the crank resurfaced.
Do i get the machine shop work done before i buy the rebuild kit and will the machine shop tell me what size bearings to get nsuch
thanks for any and all input
heres what i planning on new pistons and rods, bearings, the machine work, cam, and the crank resurfaced.
Do i get the machine shop work done before i buy the rebuild kit and will the machine shop tell me what size bearings to get nsuch
thanks for any and all input
Senior User
Joined: Oct 2003
Posts: 480
Likes: 1
From: Elyria, Ohio
1981 F250 4WD 351M
Block cleaned and new expansion plugs; bore 0.30" over
new cam bearings
recondition rods
new main and rod bearings
New 0.030 Pistons and fit conn rods and pins
valve job; new exhaust springs; two new valves; new valve seals, shave heads; recondition valve guides.
complete felpro gasket set and valley pan
Total $879 October 2004; northern Ohio
Block cleaned and new expansion plugs; bore 0.30" over
new cam bearings
recondition rods
new main and rod bearings
New 0.030 Pistons and fit conn rods and pins
valve job; new exhaust springs; two new valves; new valve seals, shave heads; recondition valve guides.
complete felpro gasket set and valley pan
Total $879 October 2004; northern Ohio
Senior User
Joined: Jun 2003
Posts: 103
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Most machine shops will want the new pistons "in hand" before doing the bore. They will want to measure the pistons for a precise side clearence. This measurement is dependant upon several factors, mainly piston type and taper. Hyperuetectics run slightly tighter than standard cast pistons and much tighter than forged. The most logical route would be to take the engine to the machine shop, let them clean and measure everything, as well as check for cracks. If everything checks out, they can order your parts for you. In most cases the machinist can buy the parts more cheaply than the consumer can. If you have no experience in engine assembly, let the shop do it for you. That is, after all, what they do. Good luck with the build....
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
twinscrew the shop here will rough bore it to make sure it will clean up at a given overbore, before ordering pistons (they basically bore it to .003 under in my example they bored my 460 block to 4.317 for a .060 over bore) then when you get the pistons he hones to size as per the manufacturors specs
Cargo Master
Joined: Dec 2004
Posts: 2,232
Likes: 3
From: NE Texas
Thanks monsterbaby. I was afraid that noone point this out. You should never just pick an oversize and buy pistons before at the very least, micing the block. A good machinist will do just like you say and bore the cylinders just shy of the first o/s to make sure that they will clean up for that o/s.
For that matter, it might be that the machinist mics the block and recommends a rering job. Take the block and crank to the machinist for measurment, and of course take him the heads for the headwork, at the very least a valve job.
Bronzewall guides would be a really good thing to do to these heads. Don't settle for just knurling.
Good luck,
Doc
For that matter, it might be that the machinist mics the block and recommends a rering job. Take the block and crank to the machinist for measurment, and of course take him the heads for the headwork, at the very least a valve job.
Bronzewall guides would be a really good thing to do to these heads. Don't settle for just knurling.
Good luck,
Doc
