hi gang the question i have is i;am using a 302 motor in a different aplication other then a camaro what i would like to know as i have to use a short water pump will i have any problem using a balancer from a 283 327 on this engine or does anyone have a suggestion as to what one i should use i cant use the 8'' balancer not with the short water pump thanks for any help in advance
302 balancer
snoopycar z
1 - 14 of 14 Posts
Joined
·
34 Posts
hi gang the question i have is i;am using a 302 motor in a different aplication other then a camaro what i would like to know as i have to use a short water pump will i have any problem using a balancer from a 283 327 on this engine or does anyone have a suggestion as to what one i should use i cant use the 8'' balancer not with the short water pump thanks for any help in advance
As others said, short water pump and 8 inch balancer will work. There is very little room, 1/16 inch clearance between the pump and balancer.
You should use a 302 balancer as designed because of the bobweight of the reciprocating assembly weight. Different strokes require different weight/thickness of balancer. See the difference between a 265/283, 307/327 and a 305/350 balancers. This from OE design. If the short block has been aftermarket balanced correctly, then use the corresponding harmonic balancer, IMO.
You should use a 302 balancer as designed because of the bobweight of the reciprocating assembly weight. Different strokes require different weight/thickness of balancer. See the difference between a 265/283, 307/327 and a 305/350 balancers. This from OE design. If the short block has been aftermarket balanced correctly, then use the corresponding harmonic balancer, IMO.
Not really so even tho GM did make a bunch of different SB balancers and at least one hub with just a pulley bolted on it..
Usually drag engines can use a hub or just the smallest you can find b/c they rpm fast up through the different harmonics for just a short time.
Whereas a road-race, Z-28 type engine need's as large a one as you can find b/c it run's up and down, up and down, up and down for a long race so needs to dampen as much harmonics as it can..
pdq67
PS., a side note -- the old 348"/409"/427" "W" engines used dampers that fit SB's!!!
Usually drag engines can use a hub or just the smallest you can find b/c they rpm fast up through the different harmonics for just a short time.
Whereas a road-race, Z-28 type engine need's as large a one as you can find b/c it run's up and down, up and down, up and down for a long race so needs to dampen as much harmonics as it can..
pdq67
PS., a side note -- the old 348"/409"/427" "W" engines used dampers that fit SB's!!!
All 302 balancers were 8", I reckon the pulley made the difference for the different WP lengths, and yes the timing mark is different from 67-68 compared to the '69 model. I believe the early balancer is still a GM performance part...
Rob
Joined
·
34 Posts
thanks i went back out there and fit the 8'' balancer on it worked out perfect
Joined
·
147 Posts
Technology has changed quite a bit from the day when we just pressed a damper on and put a bolt in the crank! If a damper did not make that much of a difference why was there so many different sizes?..... BBC first
For instance damper P/N 3879623 is a 8 in. torsional damper. That particular part was used on internally balanced 67-67 427 engines. GM recomends to use crankshaft P/N 3967811 and use P/N 14044821 timing pointer.
SBC.....
P/N 6272221 is a 6.75 damper. it is a cast iron and was used on most 69 and later production 305 -350 engines. If I remember correctly this damper will also work well on the V-6 90 deg. racing engine.
P/N 3817173 is a 8 in. damper. This one came on engines from 62-68. This availible only on hi-perf. applications from the factory. It was 1 11/16 wide.
P/N 6272224 is also a 8in. damper. came on 70-74 350 LT-1,Z/28 and the L-82 and it is also 1 11/16 wide.
P/N 3947708 is a 8 in. damper and only came on the 69 Z/28 engine. It is 1 5/16 wide.
P/N 6272225 is a 8 in. damper that came on all the 400 in. sbc engines.
P/N 364709 was the 8 in. off road damper GM offered for classes where a cast iron damper of stock apperaence was allowed. this had a special hi-temp rubber used between the hub and the inertia ring.
Myself I use ATI dampers and have had great success with them. I also use a timing belt instead of a chain and gears! you only have to buy them once....
For instance damper P/N 3879623 is a 8 in. torsional damper. That particular part was used on internally balanced 67-67 427 engines. GM recomends to use crankshaft P/N 3967811 and use P/N 14044821 timing pointer.
SBC.....
P/N 6272221 is a 6.75 damper. it is a cast iron and was used on most 69 and later production 305 -350 engines. If I remember correctly this damper will also work well on the V-6 90 deg. racing engine.
P/N 3817173 is a 8 in. damper. This one came on engines from 62-68. This availible only on hi-perf. applications from the factory. It was 1 11/16 wide.
P/N 6272224 is also a 8in. damper. came on 70-74 350 LT-1,Z/28 and the L-82 and it is also 1 11/16 wide.
P/N 3947708 is a 8 in. damper and only came on the 69 Z/28 engine. It is 1 5/16 wide.
P/N 6272225 is a 8 in. damper that came on all the 400 in. sbc engines.
P/N 364709 was the 8 in. off road damper GM offered for classes where a cast iron damper of stock apperaence was allowed. this had a special hi-temp rubber used between the hub and the inertia ring.
Myself I use ATI dampers and have had great success with them. I also use a timing belt instead of a chain and gears! you only have to buy them once....
Joined
·
147 Posts
I am wondering what the "W" stands for after the 409? Is that because the 348,409 and Z-11 427 heads looked like a "W"????
Joined
·
147 Posts
So you are using a "w" to identify a 348,409 and a Z-11 427 Mystery Engine. When I refer to a BBC should I use the words "Semi-Hemi" and with a SBC should I use the word "wedge" or even the words" Splayed Valve" for a SBC. Just havin' some fun!
1 - 14 of 14 Posts
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
